'99 & up 7.3L Power Stroke Engine and DrivetrainDiscussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

The worst feeling ever, you spend two and a half days pulling the transmission and replacing the front pump seal, and bushing, the large o-ring around the fluid pump and the damn thing still is leaking. from the inspection hole.

The fluid is red which narrows it down to tranny fluid, but I guess I am gonna get a UV test kit to make sure that it is tranny fluid.

I replaced everything, what else could it be? anybody have any ideas? I am so frustrated I could spit blood.

The TC didnt look scorned or rough where the seal was riding. I also noticed that there was no oil on the front face of the pump. Which to me if the fluid was coming from front pump seal the tranny fluid would run down the face of the pump, would this be the case?

The TC didnt look scorned or rough where the seal was riding. I also noticed that there was no oil on the front face of the pump. Which to me if the fluid was coming from front pump seal the tranny fluid would run down the face of the pump, would this be the case?

If the front pump seal is leaking the fluid would run down the middle of the pump on the outside.

How bad is the leak? If you installed all of the seals properly. It could be leaking from the converter neck or the pump itself. Both are rare but i have seen it before.

For anyone else having this is issues or your seal has gone out and your tranny is pueking fluid you MUST take the flywheel off and inspect it, Closely.. This is a common issues f350's and 450's are having. My tranny guy pulled one out of the trash and showed me the hairline cracks that develop around the crankshaft end. When we pulled mine off I thought I was ok, but upon wire wheeling it mine was cracked, thus creating the wobble that destroyed the seal that caused the leak. $160.00 bucks from the dealer with his jobber discount, Advanced,Discount and other parts stores had the China ones for cheaper but there is no way I would trust them. Good luck.

It's quite common for the factory diesel converters to actually twist the studs from the torque of the diesels on the back side of the converter and leak. This is the main reason for the billet converters. Replacing the pump bolt washers is a must and adding a little anerobic sealant to the washers is a good idea also. We always replace the converter anytime one comes in for front seal leak. Period. All get a New bushing, seal, pump oring, and gasket. As mentioned, we've been catching leaks on the dyno from cracked pumps. I like to replace them whenever I can or am allowed to. Cracked flywheels as mentioned above can contribute to this also.

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